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EP1029088A1 - Dispositif d'extraction pour four a cuve - Google Patents

Dispositif d'extraction pour four a cuve

Info

Publication number
EP1029088A1
EP1029088A1 EP98961102A EP98961102A EP1029088A1 EP 1029088 A1 EP1029088 A1 EP 1029088A1 EP 98961102 A EP98961102 A EP 98961102A EP 98961102 A EP98961102 A EP 98961102A EP 1029088 A1 EP1029088 A1 EP 1029088A1
Authority
EP
European Patent Office
Prior art keywords
shaft furnace
conveying
screw
sections
section
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP98961102A
Other languages
German (de)
English (en)
Other versions
EP1029088B1 (fr
Inventor
Martin Schmidt
Herbert Lassnig
Johann Wurm
Kurt Wieder
Georg Aichinger
Josef Ziegler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Deutsche Voest Alpine Industrieanlagenbau GmbH
Original Assignee
Deutsche Voest Alpine Industrieanlagenbau GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Deutsche Voest Alpine Industrieanlagenbau GmbH filed Critical Deutsche Voest Alpine Industrieanlagenbau GmbH
Publication of EP1029088A1 publication Critical patent/EP1029088A1/fr
Application granted granted Critical
Publication of EP1029088B1 publication Critical patent/EP1029088B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories or equipment specially adapted for furnaces of these types
    • F27B1/21—Arrangements of devices for discharging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/08—Screw feeders; Screw dischargers

Definitions

  • the invention relates to a shaft furnace, in particular a direct reduction shaft furnace, with a bed of lumpy material, in particular iron oxide and / or sponge containing lumpy material, with screw conveyors penetrating the casing of the shaft furnace for discharging the lumpy material from the shaft furnace, which are arranged above the bottom region of the shaft furnace and are stored in the casing of the shaft furnace.
  • Shaft furnaces in particular reduction shaft furnaces of the type described above, are widely known from the prior art.
  • a shaft furnace essentially designed as a cylindrical hollow body, generally contains a bed of lumpy material containing iron oxide and / or sponge iron, the material containing iron oxide being fed into the upper part of the shaft furnace.
  • a reducing gas originating, for example, from a melter gasifier is blown into the shaft furnace and thus into the solid bed.
  • the hot dust-laden reducing gas flows upwards through the solid bed and thereby reduces the iron oxide of the bed completely or partially to sponge iron.
  • the completely or partially reduced iron oxide is conveyed out of the shaft furnace by discharge devices arranged between the bottom region of the shaft furnace and the region of the gas inlet openings. These discharge devices are generally designed as star-shaped, radially (based on the shaft furnace) conveying screws.
  • the zone in the area of the shaft floor, in which the discharge devices are located should have a maximum of active discharge area, on the one hand to achieve the most uniform possible lowering of the bulk material, and also a continuous movement of the material in the reaction zone.
  • the conveyor cross section of existing screw conveyors is designed so that in each section of a screw conveyor, both the removal of material from upstream sections in the conveying direction and the removal of bulk material from the area surrounding the respective section would have to be managed. This is usually done by continuously increasing the radius of the paddle or helix envelope in the conveying direction. In addition, the conveying volume of each screw section is continuously increased by an increasing gradient of the screw flight in the conveying direction.
  • Shaft furnaces known from the prior art thus have the disadvantage that when conventional screw conveyors are used, even discharge of the bulk material located in the shaft furnace cannot even be guaranteed directly above the screw conveyors themselves.
  • the material In connection with the areas that cannot be detected anyway in the case of star-shaped screw conveyors, that is, on the one hand, the wedge-shaped areas between two adjacent screw conveyors, as well as the space left by the screw conveyor heads in the center of the shaft furnace, the material remains in the shaft furnace for different lengths of time, which in turn results in a uneven course of reduction, as well as fluctuating product qualities result.
  • the object of the present invention is therefore to provide a shaft furnace, in particular a direct reduction shaft furnace, which, owing to the screw conveyors used therein, improves the discharge of the bulk material more uniformly has, as known from the prior art shaft furnaces using conventional screw conveyors.
  • each screw conveyor projecting into the shaft is divided in the longitudinal direction into at least two adjacent sections, with the conveying cross sections of adjacent section ends increasing in the conveying direction.
  • the area forming the snail's head has no material to convey from upstream sections. So he has the entire capacity free for the material withdrawal from the fill.
  • the discharge area is divided into sections, the conveying cross section being designed in such a way that it increases abruptly during the transition from one section to the adjacent section in the conveying direction. In this area with a higher capacity than the previous section, material can again be removed from the bed.
  • the discharge area projecting into the shaft is divided into two or more such sections.
  • An important criterion when choosing the number of sections is the respective increase in the funding cross-section. With an increasing number of sections or a decreasing increase in the conveying cross-sections, the screw shape and thus the conveying characteristics approach that of the screws with a continuously increasing conveying cross-section.
  • the sudden increase in the conveying cross section in the area of mutually assigned section ends is said to be an average gradient in relation to the longitudinal axis of the screw conveyor of at least 45 °, preferably of at least 60 °, particularly preferably of essentially 90 °.
  • this transition is also advantageous to make this transition at least partially continuous.
  • the abrupt increases in the conveying cross sections in the circumferential direction of the conveying cross sections, preferably evenly distributed, with the extraction area being divided into at least three sections.
  • the conveyor cross sections are kept constant within individual sections of a screw conveyor. This embodiment is particularly easy to implement in terms of production technology.
  • the conveyor cross-sections are designed to rise continuously within individual sections of a screw conveyor.
  • This variant combines the advantages of conventional with those of the screw conveyors according to the invention, i.e. continuously increasing funding cross-sections are combined with areas of increased funding.
  • the screw surfaces of the screw conveyors are preferably formed by paddles mounted on the shafts of the screw conveyors. Although the screw surfaces can also be continuous over the entire length of the screw, screw surfaces formed by paddles are easier to produce. In the event of a repair, paddles can also be replaced much more easily.
  • the extent of the change in the size of the conveying cross section of two adjacent section ends, given as the change in its radius, is of the order of two to eight times, preferably two to six times, the average grain size of the lumpy material to be conveyed
  • experiments have shown that one Subdivision of the discharge area of a screw conveyor into three sections, an increase in the radius of the conveyor cross section of about three to four times the average grain size is particularly preferred.
  • this preferred embodiment is achieved in that, for example when using paddles, of two adjacent paddles belonging to different sections, the second is, for example, three times the average grain size larger than the first. With an average grain size of 20 mm, for example, these two paddles differ in height by 60 mm.
  • the triple mean grain size as the extent for the increase in the paddle height could be determined in experiments as being particularly advantageous when creating areas with increased conveying capacity.
  • the pitch of the screw flight of a screw conveyor in the conveying direction increases in a manner known per se, or is initially kept constant in the conveying direction and subsequently increases.
  • the volume that can be conveyed by the screw conveyor is increased in the conveying direction, so that the material that is increasingly drawn off from the bed according to the invention is actually also transported out of the shaft furnace.
  • Fig. 1 shaft furnace with screw conveyors
  • Fig. 2 schematic screw conveyor, conveyor cross-section of the individual sections is constant
  • FIG. 4 comparison of the section-related delivery services of conventional and inventive screw conveyors
  • Fig. 1 shows a shaft furnace 1 according to the invention with the bulk 2 pieces of good and the screw conveyors 3 for the discharge of the good from the shaft 1.
  • bustle zone 4 along the jacket of the shaft there are a number of gas inlet openings through which a reducing gas is blown into the bed 2.
  • a number (here six) of conveyor screws 3 arranged in a star shape above the bottom of the shaft furnace 1 accomplishes the discharge of the lumpy material.
  • the extraction area 5 of each screw conveyor 3 projecting into the shaft is divided into three sections, the conveying cross sections of the individual sections increase in the conveying direction, that is to say in the direction of the wall of the shaft furnace 1.
  • FIGS. 2 and 3 Two different embodiments of the screw conveyors 3 are shown in the drawings in FIGS. 2 and 3.
  • Fig. 2 shows a screw conveyor 3 in cross section, the conveyor part, ie the discharge area 5 projecting into the shaft, is designed in the form of an interrupted screw flight formed by paddles 6.
  • the extraction area 5 is divided into three sections 7, 8, 9, the paddle height at adjacent section ends increasing by three times the average grain size of the lumpy material to be conveyed.
  • the paddle height and thus the conveying cross section are kept constant within the individual sections 7, 8, 9.
  • the conveyor screw 3 shown in FIG. 3 differs from that shown in FIG. 2 in that the height of the paddles 6 is made continuously increasing within individual sections in the conveying direction. Only at the transition from one section to the next does the paddle height experience a sudden change in the extent of three times the average grain size of the lumpy material.
  • FIG. 4a to 4c show a comparison of the section-related conveying characteristics of conventional screw conveyors and those with an abruptly increasing conveying cross section.
  • the conveying capacity of a conventional screw conveyor (Fig. 4a) is significantly higher at the screw head (1st chamber) and near the wall of the shaft furnace (5th chamber) than in the middle areas (2nd - 4th chamber) of the screw conveyor.
  • a subdivision of the screw conveyor into two sections with different conveying cross-sections results in an increase in the conveying capacity in the area of increasing the conveying cross-section (3rd chamber). Only a subdivision into three sections results in a constant conveying capacity over most of the fume cupboard area.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Organic Chemistry (AREA)
  • Screw Conveyors (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Manufacture Of Iron (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Tunnel Furnaces (AREA)
  • Gear Transmission (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)

Abstract

L'invention concerne un four à cuve (1), notamment un four à cuve de réduction directe, comportant une charge (2) de matériau en morceaux contenant notamment de l'oxyde de fer et/ou du fer spongieux, ainsi que des vis sans fin (3) permettant d'extraire le matériau en morceaux du four à cuve (1). Ces vis sont contenues dans la paroi du four, dans laquelle elles sont montées et sont disposées au-dessus de la région inférieure du four à cuve (1).
EP98961102A 1997-11-07 1998-10-26 Dispositif d'extraction pour four a cuve Expired - Lifetime EP1029088B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT189297 1997-11-07
AT0189297A AT405455B (de) 1997-11-07 1997-11-07 Schachtofen
PCT/EP1998/006794 WO1999024626A1 (fr) 1997-11-07 1998-10-26 Dispositif d'extraction pour four a cuve

Publications (2)

Publication Number Publication Date
EP1029088A1 true EP1029088A1 (fr) 2000-08-23
EP1029088B1 EP1029088B1 (fr) 2001-10-04

Family

ID=3523275

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98961102A Expired - Lifetime EP1029088B1 (fr) 1997-11-07 1998-10-26 Dispositif d'extraction pour four a cuve

Country Status (17)

Country Link
US (1) US6280181B1 (fr)
EP (1) EP1029088B1 (fr)
JP (1) JP2001522937A (fr)
KR (1) KR100557232B1 (fr)
CN (1) CN1090680C (fr)
AT (1) AT405455B (fr)
AU (1) AU735530B2 (fr)
BR (1) BR9812775A (fr)
CA (1) CA2308388A1 (fr)
DE (1) DE59801664D1 (fr)
PL (1) PL340872A1 (fr)
RU (1) RU2194770C2 (fr)
SK (1) SK6672000A3 (fr)
TR (1) TR200001243T2 (fr)
TW (1) TW406178B (fr)
WO (1) WO1999024626A1 (fr)
ZA (1) ZA9810170B (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6429481B1 (en) 1997-11-14 2002-08-06 Fairchild Semiconductor Corporation Field effect transistor and method of its manufacture
AT505490B1 (de) 2007-06-28 2009-12-15 Siemens Vai Metals Tech Gmbh Verfahren und vorrichtung zur erzeugung von eisenschwamm
CN102620552B (zh) * 2012-04-01 2013-03-20 云南祥云中天锑业有限责任公司 一种用于锑氧粉冶炼的立式挥发炉
CN102925614A (zh) * 2012-11-22 2013-02-13 中冶赛迪工程技术股份有限公司 一种竖炉排料装置
CN103408232A (zh) * 2013-08-21 2013-11-27 山东省聚祥窑炉有限公司 一种立式石灰窑窑门
CN111910037B (zh) * 2020-08-07 2022-01-25 唐山中科乾海环保科技有限公司 竖炉直接还原装置及其排料方法
CN113023397B (zh) * 2020-09-18 2025-08-08 南京利卡维智能科技有限公司 一种粉状颗粒输送方式及其分料结构

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1557773A (en) * 1922-04-03 1925-10-20 Efficiency Mfg Co Fuel-feeding apparatus
US3704011A (en) * 1971-08-12 1972-11-28 Mintech Corp Discharge mechanism for shaft kiln
SU767170A1 (ru) * 1976-11-01 1980-09-30 Всесоюзный научно-исследовательский и проектный институт алюминиевой, магниевой и электродной промышленности Вертикальна печь дл термообработки углеродистых материалов
AT372109B (de) * 1982-01-11 1983-09-12 Voest Alpine Ag Vorrichtung zum austragen von heissem gut, insbesondere von eisenschwamm aus einem schachtofen
DE4116215A1 (de) * 1991-05-17 1992-11-19 Hilti Ag Trommelfoermige transporteinrichtung
AT397378B (de) * 1992-07-07 1994-03-25 Voest Alpine Ind Anlagen Fördereinrichtung zum dosierten fördern von schüttgut
KR100276324B1 (ko) * 1996-12-20 2000-12-15 이구택 용융환원 장치 및 이를 이용한 용융선철 제조방법

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9924626A1 *

Also Published As

Publication number Publication date
CN1090680C (zh) 2002-09-11
AT405455B (de) 1999-08-25
RU2194770C2 (ru) 2002-12-20
JP2001522937A (ja) 2001-11-20
EP1029088B1 (fr) 2001-10-04
TR200001243T2 (tr) 2000-11-21
CA2308388A1 (fr) 1999-05-20
SK6672000A3 (en) 2000-11-07
ATA189297A (de) 1998-12-15
AU735530B2 (en) 2001-07-12
CN1278305A (zh) 2000-12-27
US6280181B1 (en) 2001-08-28
WO1999024626A1 (fr) 1999-05-20
KR100557232B1 (ko) 2006-03-07
PL340872A1 (en) 2001-03-12
AU1664399A (en) 1999-05-31
BR9812775A (pt) 2000-10-10
TW406178B (en) 2000-09-21
ZA9810170B (en) 1999-05-07
DE59801664D1 (de) 2001-11-08
KR20010031825A (ko) 2001-04-16

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